Padlook



(Model.)

P. YoB av J. KIRBY, Jr.

' PADLOCK.

No. 275,970. Patented Apr.17,1883.

l NITED STATES PATENT erica.

PHILIP YOE, OF CINCINNATI7 CHIO,AND JOHN KIRBY, JR., 0F LUDLOW, KENTUCKY.

PADLOCK.

SPECIFICATION forming part of Jetters Patent No. 275,970, dated April 17, 1883.

Application filed October 20, 188%. (Modell .To all whom it may concern:

Be it known that we, PHILIP YOE and JOHN KIRBY, Jr., both citizens ofthe United States,

residing respectively at Cincinnati, in the county ot' Hamilton and State of Ohio, and Ludlow,.

in the county of Kenton, in the State of Kentucky, have invented a new and useful Improvement in Padlocks, of which the following is a specitication.

Our invention relates to that class ot" springpadlocks from which the key cannot be withdrawn after the shackle has been thrown open until it is again closed and locked.

We are aware that padlocks have been made to retain the key, after having` been unlocked, until the shackle is again closed and caught by the detent, as shown in Letters Patent No. 198,713,1or instance, but in such locks as heretofore constructed the key has been free to turn cuits post, but is held immovable until the shackle shall have been closed to locking position. This has been found to be a serious fault, especially for railway use, as persons not familiar with the construction ot the lock are apt to apply suflicient force to break the key in endeavoring to extract it.

Our invention consists essentially in securing to the face of the main tumbler a thin plate or lug working in close proximity to the front wall of the case, and provided with a longitudinal slot to adapt its sidewise movement when the key is inserted, and avertical slot for the admission of' the lip of the key, so that when the key is turned in the lock it carries the tumbler and its attached plate upward, (and sidewise,) thusshifting the retaining plate or lug, so that its vertical slot will no longer register with the key-hole, hence preventing the withdrawal of the key.

In order that our invention may be l'ully understood, we will proceed to describe it with reference to the accompanying drawings, in which- Figure 1 is a perspective view ot' a padlock with the faceplate removed, showing the shackle locked and the key free to be withdrawn, the vertical slot in the retaining plate or lug being in register with the key-hole. Fig. 2 is a side elevation of a padlock, showing in 5o dotted lines the shackle open and the vertical slot in the retaining-plate out of register with the key-hole. Fig. 3 is a perspective view of the tumbler and retaining-lug removed from the ease. Fig. 4 is a perspective view of the tumbler and another form ofretaining-lug, also removed from the case. v

A represents the tumbler, pivoted on a post, B, and having an arm, a, extending beyond said post. To the face of the main arm of this tumbler is secured a thin plate or lug, C, working in close proximity to the face-plate of the case, and having a longitudinal slot, c, in its center and a transverse slot, o', extending at right angles to the main slot c. The slot c is made the width ofthe diameter ot' the stemot' the key, and is of sucient length to allow the necessary sidewise movement, and the slot c' the width and length of the bit D of the key. The bit D is ot' such height that it can lturn freely under the retaining-lug without contact therewith. A shackle, F, is pivoted at'g, and has a supplemental arm,f, extending downward beyond said pivot, working in connection with the rear arm, a, of thel tumbler A. A spring, H, is coiled at its center around a hub, h, the upper end bearing against the back part of the armf of the shackle F, so as to throw the shackle open when its armfis released by the arm a of the tumbler, and the other end bears against the under side of the arm a ot said tumbler to throw it up in front of the armf, thus preventing the opening ot the shackle until the key shall have been turned.

Supposing the parts to be in the position shown in Fig. 1, (or locked in position,),the 0perati'on is as follows: When the key is turned the bit passes under the retaining plate or lug C and bears upward against the under side ot' the arm A ot' the tumbler, swinging it on its pivot, thereby carrying up the main arm A and the retaining-lug` C and depressing the supplemental arm a. This depression ot' the supplemental arm a releases the armfot the shackle., and the upper arm of the spring H, bearing against theback of said arm f, swings the shackle on its pivot g, thereby opening it and throwing its armf forward, so as to engage ou the top ot' the arm c and liold it in its depressed position, tlie parts being-then in the Ico position shown in Fig. 2. The operation of the parts thus separately described are simultaneous. It will be seen that the key is now free to turn in the cast, it being out of contact with all the working parts, and that it cannot be extracted until the shackle is again closed, when the parts will resume their position shown in Fig. 1. This construction may be varied without departing from the nature ot' our invention.

Fig. 4 shows a modification in the construction ofthe retaining-lug, in which an arm, N, is pivoted to the side wall of the lock, and is formed with a lug, M, under which the key may pass, and which, when the tumbler is raised, stands across the key-hole to prevent the withdrawal of the key. The arm is opera-ted by the tumbler, and is held in contact therewith by suitable detaning-lugs.

Having thus described our1nvention, the following is what we claim as new vtherein and desire to secure by Letters Patent:

In a padlock, a key-retaining lug or projection formed on the face of the tumbler, or an arm thereof, and adapted, when the tumbler PHILIP YOE. JOHN KIRBY, Jn. Witnesses:

BENJ. H. 00X, J EPTHA GARRARD. 

